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Shellside evaporation in a TEMA E-shell: flow patterns and transitions.

Author(s) : DOO G., MCNAUGHT J. M., DEMPSTER W. M.

Type of article: Article

Summary

This article describes some results from a research programme to study forced flow shellside boiling in a TEMA E-type shell and tube heat exchanger. It focuses on the particular issue of the effect of apparent transitions in the two-phase flow pattern. The results from the programme show a drop in the heat transfer performance at lower mass fluxes and higher vapour qualities. The sudden drop in performance may be caused by a change in the two-phase flow pattern on the shellside from a homogeneous type to a stratified type of flow with separation of the liquid and vapour phases. Support for this conclusion is that the transition in heat transfer performance appears to coincide with a change in the behaviour of the measured two-phase pressure drop multiplier. A model is described which allows for the effects of separated flow and also attempts to predict the apparent transition in the two-phase flow pattern.

Details

  • Original title: Shellside evaporation in a TEMA E-shell: flow patterns and transitions.
  • Record ID : 2004-2752
  • Languages: English
  • Source: Applied Thermal Engineering - vol. 24 - n. 8-9
  • Publication date: 2004/06

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